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The pressure in a vessel that contained pure oxygen dropped from 1000mm to 750mm in47 minutes as the oxygen is leaked through a small hole.when the same vessel was filled with another gas the pressure dropped from 1000mm to 750 in 74 minutes.What is the molecular weight of the second gas?

The pressure in a vessel that contained pure oxygen dropped from 1000mm to 750mm in47 minutes as the oxygen is leaked through a small hole.when the same vessel was filled with another gas the pressure dropped from 1000mm to 750 in 74 minutes.What is the molecular weight of the second gas?

Grade:11

1 Answers

Vikas TU
14149 Points
7 years ago
Rate of diffusion,
dP/dt => (1000-750)/47 = PA/root(32*T)..........(1)
 (1000-750)/74 = PA/root(M*T).............(2)
dividing both the eqns. we get,
M = (74/47)^2*32 = > 79.32 approx.
that is the molar mass of the Br gas.

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